Method of preparing silicon-monoxid powder.



v.4; csizen ofthe United States,

HENRY uonnrcrrnn or NEW neonates, NEW YORK, ASSIGNOR To GEO. wssrmcnousn,

OF PITTQBTIRG, PENNSYLVANIA:

METHOD OF PREPARING SILICON-IMOEJGXED EQWDER.

Specification of Letters Patent.

Patented. Dec. 31. 1907.

Application filed une 1905: Serial No. 264.555.

T coll whom it mag concern: e it known that l, H NRY NO L POTTER, nd resident of New Rochelle, county of Westchester, State of New York, have invented certain new and useful Improvements in Methods of Preparing Silicon-MonoXid Powder, of

which the following is a specification.

tion and application.

In an application for Letters Patent of the United States Nuniher 238,925, filed December 30, 1904, I have described a method of producing silicon monoxid andhave also the product itself. The main portion of the product appears in the form or" a finelv dlvided powder, while a smaller portion ap pears 1n vitreous form.

I have found that the powder is especialiy available for certain useful applications in the arts and-that its range of utility is apparently wider than that of the vitreous suhstance. Accordingly, I have devised means for reducing the Vitreous monoxid' to the iorm of a finely divided powder and such means form the subject of the present inven- The vitreous silicon m'onoxid is broken into granular form and charged into an electrio furnace, preferably of the vacuum type, and there subjected to. a high temperature, whereby i find it is not melted into a bath, but appears to he subiirned or volatilized. and driven away from the high I locus, cooling and settling in divided statelreferred to in the tioned application. 1

It is not necessary to remove the vitreous aforemensihcon monoxid from adhering silica, silicon carbid, or carbon,

as these substances-can react in a manner described in my former temperature the finely application to liberate silicon monoxid, a reaction which can go on together with the transformation of vitreous .into powdered l material for producing the useful, powdery modification of silicon monoxid. Ill-using the term "silicon monoxid, I do not refer exclusively to the pure material,but to such crude material, chemically speaking, as is produced from sources of usual commercial purity.

I claim as my invention i. The method of producing silicon monoxid powder which consists in distilling vitreous silicon monoxid.

2. The method of producing silicon mo noxid powder, which consists in highly heating vitreous silicon monoxid in an electric furnace in the absence of oxidizing gases.

3. The method of producing silicon monoxid powder, which consists in highly heatingvitreous silicon monoxid in an electric furnace in the absence of oxidizing gases, under reduced pressure.

The method of producing silicon monoxid powder, which consists in heating a combination of vitreous Sit} with a reactive.-

. 70 in the county of HENRY NOEL POTTERQ Witnesses: v

CAPEL, I GEORGE H. Srooxsnrnen. 

